19330

Appears in sequences

• Number of permutations that are 2 "block reversals" away from 12...n.at n=16A007972
• Cycle class sequence c(n) (the number of true cycles of length n in which a certain node is included) for zeolite BEA = Beta Na7[Al7Si57O128] starting with a T4 atom.at n=13A019070
• 1/16 the number of (n+1) X 8 0..3 arrays with all 2 X 2 subblocks having the same four values.at n=11A184037
• G.f. A(x) satisfies: A(x) = x * (1 + A(x) + A(x^2)^2 + A(x^3)^3 + ...).at n=49A332753
• a(n) = Sum_{d|n} phi(d)^(n/d+1).at n=29A342488